Rose Byrne and Bobby Cannavale

Supportive girlfriend! Newly blonde actress Byrne celebrated her Boardwalk Empire beau Cannavale's Outstanding Supporting Actor in a Drama Series Emmy win at HBO's after party in L.A. on Sept. 22. A source tells Us the couple kissed "over and over" at the party and appeared to "genuinely in love." The insider all says Emmy winner Cannavale couldn't stop smiling.